Reference guides for engineers and buyers of machined parts — tolerances, materials, finishes, design for manufacturability and sourcing from China.
A good metal knob depends as much on its bore fit and runout as on its finish. This guide covers knurling patterns, materials, finishes and the main ways knobs attach to shafts in audio, appliance and automotive controls.
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Sheet metal is usually cheaper for uniform-wall enclosures and brackets, while CNC machining wins on varying thickness and tight tolerances. This guide compares both and explains bend radius and K-factor basics.
Most quality problems with imported machined parts come from requirements that were never written down. This guide walks through the RFQ package, first article approval, inspection documents, Incoterms and shipping.
Most of the cost of a machined part comes from machine time, setups and inspection rather than material. These 12 design rules target each of them without changing how the part works.
More axes mean fewer setups and access to more angles, but also a higher hourly rate. This guide explains what each machine type does and when 5-axis machining actually lowers the cost of a part.
Anodizing grows into and out of the aluminum surface, which changes bores, shafts and threads. This guide covers Type II and Type III thickness, masking, color control and how to call out anodizing correctly.
7075-T6 is far stronger than 6061-T6, but it is not stiffer, it does not weld and it costs more. This comparison shows when each alloy is the right choice for machined parts.
Tighter tolerances do not raise cost in a straight line; they raise it in steps as process and inspection change. This guide explains what ±0.05, ±0.01 and ±0.005 mm really demand and how to call tolerances out on a drawing.